I used to give my Oma (grandmother) a present for mothers day. but in our case we were incredibly close and for quite a few years her and my Opa raised me (so i also give him a present on fathers day for example).

This is my first Mothers Day without my Oma and man, how I wish she were here so that I could shower her with love and gifts...

IMHO gifts should only be given with love and caring, not out of a sense of duty ITMS, so yeah i think it is kind of weird if it's expected or demanded that you have to give presents to your grandmother.